Flexible structure with perforation-free inflation channel
The present disclosure relates to inflatable flexible structures. An inflation region may run longitudinally through the inflatable flexible structure allowing the inflation of chambers. The inflatable chambers may be separable at transverse lines of weakness formed by perforations. The inflation conduit may be free of the perforation. Additionally or alternatively, the perforations may be chevron shaped.
1. An inflatable cushion, comprising:
a first film ply extensive in a longitudinal direction and a lateral direction;
a second film ply extensive in the longitudinal direction and the lateral direction and overlaid on and sealed to the first film ply such that the plies define therebetween:
an inflation region extending longitudinally between the plies and being operable to receive a nozzle, and
a plurality of chambers extending transversely from the inflation region, wherein each of the plurality of chambers has an opening to the inflation region which contains no valves therewithin and which has a configuration which allows fluid flow from the inflation region to its respective chamber in the plurality of chambers to enable filling of the chambers with fluid injected into the inflation region from the nozzle, and from the plurality of chambers to the inflation region;
wherein the overlapping plies include a plurality of lines of alternating lands and slits that extend transversely across the plies substantially excluding the inflation region by terminating approximately the same location as transverse seals proximate to the inflation region, with the transverse seals defining the longitudinal sides of the plurality of chambers, the lines of alternating lands and slits being configured to facilitate tearing through the plies to separate portions of the inflatable cushion.
2. The inflatable cushion of claim 1 , wherein the inflation region includes a strip of material that is a portion of the plies not crossed by the plurality of lines of alternating lands and slits, wherein the strip of material connects the portions of the plies that are separated by torn lines of alternating lands and slits.
3. The inflatable cushion of claim 2 , wherein the lines of alternating lands and slits are more easily torn than the strip of material and the lines of alternating lands and slits separate the chambers and when torn at the lines of alternating lands and slits, chambers form fingers being connected to one another at the strip of material.
4. The inflatable cushion of claim 3 , wherein a first finger and a second finger have different longitudinal widths.
5. The inflatable cushion of claim 2 , wherein the lines of alternating lands and slits extend all the way to one edge of the first film.
6. The inflatable cushion of claim 1 , wherein the inflation region comprises unattached edges of the first and second film plies proximal to a first longitudinal edge with a longitudinal connected portion positioned parallel and adjacent thereto.
7. The inflatable cushion of claim 1 , wherein the first and second film plies include a first longitudinal connected portion positioned proximal to a first longitudinal edge with a second longitudinal connected portion positioned parallel and adjacent thereto, with the first longitudinal seal and the second longitudinal seal defining the inflation region.
8. The inflatable cushion of claim 7 , wherein the inflation region is a longitudinal conduit.
9. The inflatable cushion of claim 1 , wherein the plurality of alternating lands and slits are defined by perforations formed from slits that have portions that extend in a direction that has both a longitudinal and a transverse component and the slits extend through one of at least the first film ply or the second film ply with each end of the slits proximate to an end of an adjacent slit thereby forming a line of slits transversely across the first film ply and the second film ply.
10. The inflatable cushion of claim 9 , wherein the slit is a straight slit.
11. The inflatable cushion of claim 9 , wherein the slit is a chevron shaped slit.
12. The inflatable cushion of claim 1 , wherein the plurality of lines of alternating lands and slits are defined by perforations formed from transverse straight slits.
13. An inflatable cushion, comprising:
a first film ply extensive in a longitudinal direction and a lateral direction;
a second film ply extensive in the longitudinal direction and the lateral direction and overlaid on and sealed to the first film ply such that the plies define therebetween:
a continuous inflation region extending longitudinally, and
a plurality of chambers extending transversely in fluid communication with the inflation region, wherein each chamber in the plurality of chambers includes an opening to the inflation region which has a configuration to allow fluid flow from the inflation region to each of the plurality of chambers to enable filling of the chambers with fluid injected into the inflation region, while not preventing fluid flow from the plurality of chambers to the inflation region; and
overlapping lines of weakness extend transversely across each of the plies and less than completely across the plies forming a longitudinal strip of connected material substantially excluding the inflation region by terminating approximately as the same location as the plurality of chambers proximate to the inflation region, the lines of weakness being more easily torn than the longitudinal strip of connected material facilitating tearing through the plies to separate portions of the inflatable cushion.
14. The inflatable cushion of claim 13 , wherein the lines of weakness extend all the way to one edge of the first film ply but not the opposite edge of the first film ply.
15. The inflatable cushion of claim 14 , wherein the lines of weakness separate the chambers and when torn at the lines of weakness, chambers form fingers being connected to one another at the longitudinal strip of connected material.
16. The inflatable cushion of claim 13 , wherein the inflation region is free of lines of weakness forming at least a portion of the longitudinal strip of connected material.
17. The inflatable cushion of claim 1 , wherein the first ply includes one or more layers of material extruded together into a single ply of material.
18. The inflatable cushion of claim 1 , wherein the lines of alternating lands and slits extend approximately the same length as the transverse seal.
19. The inflatable cushion of claim 13 , wherein the lines of weakness terminate at approximately the same location as transverse seals defining the plurality of chambers proximate to the inflation region.
20. The inflatable cushion of claim 19 , wherein the lines of weakness extend approximately the same length as the transverse seal.
21. The inflatable cushion of claim 1 , wherein the one or more lines of alternating lands and slits extend an entire transverse length of the plurality of chambers.
22. The inflatable cushion of claim 1 , wherein the one or more lines of alternating lands and slits terminate at the inflation region.
23. The inflatable cushion of claim 13 , wherein the opening contains no valves therewithin.